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Investment Securities Investment Securities-Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity | $ 10,680 | $ 11,137
Held-to-maturity, Gross Unrealized Gains | 209 | 57
Held-to-maturity, Gross Unrealized Losses | 10 | 87
Held-to-maturity, Fair Value | 10,879 | 11,107
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 75,005 | 80,784
Available-for-sale, Gross Unrealized Gains | 580 | 225
Available-for-sale, Gross Unrealized Losses | 476 | 1,164
Available-for-sale, Fair Value | 75,109 | 79,845
Government National Mortgage Association (GNMA) |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity | 1,113 | 1,214
Held-to-maturity, Gross Unrealized Gains | 69 | 40
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 1,182 | 1,254
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 3,907 | 4,443
Available-for-sale, Gross Unrealized Gains | 21 | 25
Available-for-sale, Gross Unrealized Losses | 15 | 86
Available-for-sale, Fair Value | 3,913 | 4,382
Federal Home Loan Mortgage Corporation (FHLMC) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 10,243 | 11,104
Available-for-sale, Gross Unrealized Gains | 148 | 69
Available-for-sale, Gross Unrealized Losses | 25 | 148
Available-for-sale, Fair Value | 10,366 | 11,025
Federal National Mortgage Association (FNMA) |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity | 8,567 | 8,923
Held-to-maturity, Gross Unrealized Gains | 131 | 0
Held-to-maturity, Gross Unrealized Losses | 10 | 87
Held-to-maturity, Fair Value | 8,688 | 8,836
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 25,504 | 27,094
Available-for-sale, Gross Unrealized Gains | 363 | 131
Available-for-sale, Gross Unrealized Losses | 225 | 617
Available-for-sale, Fair Value | 25,642 | 26,608
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity | 9,680 | 10,137
Held-to-maturity, Gross Unrealized Gains | 200 | 40
Held-to-maturity, Gross Unrealized Losses | 10 | 87
Held-to-maturity, Fair Value | 9,870 | 10,090
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 39,654 | 42,641
Available-for-sale, Gross Unrealized Gains | 532 | 225
Available-for-sale, Gross Unrealized Losses | 265 | 851
Available-for-sale, Fair Value | 39,921 | 42,015
US Government Agency Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 30,310 | 33,089
Available-for-sale, Gross Unrealized Gains | 13 | 0
Available-for-sale, Gross Unrealized Losses | 205 | 236
Available-for-sale, Fair Value | 30,118 | 32,853
Corporate Bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity | 1,000 | 1,000
Held-to-maturity, Gross Unrealized Gains | 9 | 17
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 1,009 | 1,017
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 5,041 | 5,054
Available-for-sale, Gross Unrealized Gains | 35 | 0
Available-for-sale, Gross Unrealized Losses | 6 | 77
Available-for-sale, Fair Value | $ 5,070 | $ 4,977

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